Copy metadata from `bevy_new_2d`

[benfrankel]

The following files should be copied over:

• .github/workflows/ (but keep this template's ci-generate.yaml)
• .vscode/
• .idea/
• .editorconfig
• .gitignore (should be identical already)
• Cargo.toml (and Cargo.toml.template, and run cargo update for Cargo.lock)
• clippy.toml
• README.md (not the whole file, but copy / adapt the relevant sections)
• README.md.template (edit to link to bevy_new_minimal instead of bevy_new_2d, and update post-generate.rhai accordingly)

This should be considered a "checkpoint", not a commitment to keep the files in sync between all templates. We should wait on that until the files are more stable (which is probably still a long way out).

bevy_new_2d should also remain the "source of truth" for these files for now IMO.

[benfrankel]

I think we should wait until after Bevy Jam 7 6 before doing this.

Also I'm not sure what we should do about docs/: Duplication seems wrong, and some of the docs might be slightly different depending on the template (like patterns.md and tooling.md). On the other hand, docs/workflows.md might be a better fit for this template than it is for bevy_new_2d. Maybe bevy_new_2d could link to this repo's docs/workflows.md instead of having its own copy.

[janhohenheim]

I assume you meant after jam 6?